Aminophenylsulfonylphenylamino-alkanoic acids



Patentecl Mar. 18, 1952 AMINOPHENYLSULFONYLPHENYLAMINO- ALKANOIC ACID S Albert L. Rawlins, Grosse Pointe Woods, Mich., assignor to Parke, Davis & Company, Detroit, Mich., a corporation of Michigan No Drawing. Application November 23, 1948, Serial No. 61,742

Claims. (Cl. 260397.6)

This application is a continuation-in-part of my copending application Serial No. 481,007, filed March 29, 1943, now Patent No. 2,454,835, issued November 30, 1948, and the invention relates to substituted diamino diphenyl sulfones and to processes for obtaining the same. More particularly, the invention relates to substituted diamino diphenyl sulfones characterized by one free amino group and an amino group bearing a residue of a lower aliphatic carboxylic acid or ester bound to the amino group by a carbonnitrogen bond. These products have the general formula,

where R represents a residue of a lower aliphatic carboxylic acid or ester bound to the nitrogen atom by a carbon-nitrogen bond.

The products of the above general formula form water-soluble salts with both inorganic and organic acids. The products containing a free carboxylic acid group also form water soluble salts with alkalis. Some examples of the alkaline type salts formed by the compounds containing a free carboxylic acid group are the sodium, potassium, ammonium, lithium, magnesium and the like salts. Some of the acid type of salts formed by all of the products are the hydrochloride, hydrobromide, hydroiodide, sulfate, sulfamate, acetate, propionate and the like salts. The new products and their water soluble salts are valuable therapeutic agents and intermediates for therapeutic agents. They are generally effective against diseases and infections caused by micro-organisms such as streptococci, staphylococci, pneumococci and mycobacterium tuberculosis. Many of them are eiiective as antiseptics upon oral administration. They are of low toxicity and very stable chemically.

In accordance with the invention these products are produced by reacting p,p'-diamino diphenyl sulfone with a halogenated lower aliphatic acid or ester as illustrated by the following diagram:

where R has the same significance as given above and X is a halogen atom. When a halogenated lower aliphatic acid ester is employed as the starting material the carbalkoxyalkyl substituted diamino sulfone can be converted, if desired, to

1 ester removed by distillation in vacuo.

the corresponding p-amino-p-(carboxyalkylamino) diphenyl sulfone by hydrolysis.

The invention is illustrated by the following examples Ezcwmple 1.-p-Ami1w-p-;3-(carboxyethylamino) diphenyl sulfone 100 grams of 4,4'-diamino diphenyl sulfone, 260 grams of ethyl fi-bromopropionate and 700 cc. of alcohol are mixed together and refluxed for 18 hours. The alcohol and excess ethyl fl-bromopropionate are then distilled 011? on a steam bath under reduced pressure. The residue consisting of the hydrochloride salt .of p-aminop'-(fl-carbethoxyethylamino) diphenyl sulfone is mixed with 1,000 cc. of alcoholic KOH (10%) and refluxed for 3 hours on the steam bath. Most of the alcohol is removed by distillation and the residue consisting of the potassium salt of p-amino-ps-carboxyethylamino) diphenyl sulfone diluted with 10 volumes of water. It is then filtered by gravity and dilute HCl added until no more separation occurs. The thick, viscous precipitate, which is soluble both in acid and alkali, is dissolved in 10% HCl and charcoaled. After filtering from the charcoal, the fil-. trate containing the hydrochloride salt of p-ami-. no-p-( s-carboxyethylamino) diphenyl sulfone is neutralized and the precipitate dried under reduced pressure in the steambath. The dried residue is extracted with acetone and the acetone removed irom the extract under reduced pressure on the steambath. The residue is then dried in a vacuum desiccator over P205. 35 grams of a yellow solid is obtained melting at 75 C. (after first becoming more compact at C.) The properties and analyses of the produce show it to be the desired p-amino-p lp-carboxyethylamino) diphenyl sulfone.

Emwmple 2.p-Amino-p-(a-oarbomy-n-propylamino) diphenyl sulfone A mixture consisting of 24.8 g. of p,p-diamino diphenyl sulfone, 30 g. of ethyl a-bromobutyrate and 200 cc. of alcohol is refluxed for twenty hours and then the alcohol and excess halogenated The residue which consists of the hydrobromide salt of p-amino-p- (a-carbethoxy) -n-propylamino diphenyl sulfone is mixed with 350 cc. of 10% alcoholic sodium hydroxide and the mixture re- 3 4 fiuxed for about four hours. The alcohol is repotassium hydroxide and the mixture refluxed moved by distillation in vacuo and the residual for five hours. The alcohol is removed by distilsodium salt of p-amino-p'-(a-carboxy)-n-prolation in vacuo and the residue which consists pylamino diphenyl sulfone precipitated from the chiefly of the potassium salt of p-amino-p'-(pfiltrate by the addition of dilute hydrochloric 5 carboxy-n-propylamino) diphenyl sulfone taken acid. The crude acid can be purified by dissolvup in water. The solution is treated with charing it in dilute hydrochloric acid, charcoaling the coal, filtered and the desired p-amino-p-( 3-carsolution and liberating the free acid from the hyboxy-n-propylamino) diphenyl sulfone precipidrochloride salt by the addition of alkali. The tated from the filtrate by the addition of dilute product so obtained is extracted with acetone, y c ric ac dthe acetone solution dried and the acetone dis- Some further examples of the products which tilled to obtain the pure acid as a light yellow can be produced by the use of the above desolid. scribed procedure are:

0 rim-Oso;-C m1-cmcmcmcmcmc H: OCHzC-HzCHaCHa Example 3.p-Amino-p'-(carboxymethylamino) O diphenyl sulfone NHz-O-S OzNHCHzCH-C 0 on. on NHOsoONH-cmo g 24.8 g. of p,p'-diamlno diphenyl sulfone and 150 T g. of methyl chloroacetate in 150 cc. of alcohol T Q O are refluxed together for twenty-four hours and 7 001115 then the alcohol and excess halo ester distilled in vacuo. The residue which consists of the hydrochloride salt of p-amino-p-(carbomethoxy- Mia-O STONE methylamino) diphenyl sulfone is mixed with an 'Q alcoholic solution containing 2.5 g. of lithium 40 What I claim hydroxide and the mixture refluxed for four hours. The alcohol is removed by distillation in A P P of the class conslstmg of a mono and the residual lithium salt of carboxylic acid, water soluble salts thereof, lower p'-(carboxymethylamino) diphenyl sulfone taken alkyl ester? of sald i Waiter Soluble Salts up in water The solution is filtered and the thereof, said carboxylic acid having the formula, trate acidified until no more precipitation occurs. The p amino p (carboxymethylamino) 'O 'O alkylm'c 00H diphenyl sulfone thus obtained is collected and 2. A compound having the formula,

The hydrobromide salt of this product may be prepared, if desired, by dissolving the free acid in HQNG FO O M flene-C 00H acetone, adding an equivalent amount of hydrogen bromide dissolved in acetone to the so- 3. An alkali metal salt of a compound of lution and distilling off the acetone. formula,

The sodium salt of p-amino-p-(carboxymethylamino) diphenyl sulfone is prepared by dis- ,N O O,O H 1 l l coofl solving the free acid in an aqueous solution containing one equivalent of sodium hydroxide and -Am'n be e h lam d henevaporatmg the solution to dryness in vacuo. 4 p I o p car Xy t y m0 1p yl sulfone. Example 4.--p Amino p (p carbomy n 5- p- 0-p- 0 y- -p 0py1a 0 dipropylamz'no) diphenyl sulfone D y sulfo e.

Q ALBERT L. RAWLINS.

011 The following references are of record in the A mixture consisting of 24.8 g. of p,p'-diamino file of this patent: diphenyl sulfone, 25 g. of isopropyl a-methyl-pbromopropionate and 200 cc. of isopropanol is re- UNITED STATES PATENTS fiuxed for twenty hours and then the isopropanol b r Name Date and excess halo ester removed by distillation in 2,224,15 Kham h t 1 Dec, 10, 1940 vacuo to obtain the hydrobromide salt of 2,243,2 3 Rarziss t a1 July 8, 1941 p amino p (fi-carboisopropoxy-n-propyl- 2,267,748 Pohls et a1 Dec. 30, 1941 amino) diphenyl sulfone. The residue is mixed with an alcoholic solution containing 5.6 g. of (Other references on following page) UNITED STATES PATENTS Number Number OTHER REFERENCES Name Date Jackson et al., "J. Am. Chem. Soc.," Vol. 70, Kharasch et a1. Nov. 3, 1942 Feb. 1948, pp. 680-684. Dohrn et a1 Sept. 7, 1943 5 Ciocca. et aL, La Chimi-ca e LIndustria (Italy), vol. 26, Nov. 1944, pp. 167 to 170. FOREIGN PATENTS Smith, New York State Journal of Medicine,

Country Date v01. 45 (1945), p. 1667. Great Britain Aug. 9, 1938 France Apr. 1'7, 1939 France Apr. 1, 1940 10 

1. A COMPOUND OF THE CLASS CONSISTING OF A CARBOXYLIC ACID, WATER SOLUBLE SALTS THEREOF, LOWER ALKYL ESTERS OF SAID ACID, AND WATER SOLUBLE SALTS THEREOF, SAID CARBOXYLIC ACID HAVING THE FORMULA. 